Pro Mini ATMEGA328P 3.3V 8MHz (Arduino clone)

Specifications:
- Microcontroller: ATmega328
- Operating voltage: 3V
- Clock speed: 8MHz
- Input voltage (recommended): 5-12V
- 14 digital input/output pins of which 6 can be used as PWM.
- 8 Analog inputs A0-A7
- Maximum current per I/O pin: 40mA
- Power and status LEDs
- Reset button
- 16KB Flash memory (of which +/- 0.5KB is used by the bootloader)
- EEPROM 512 bytes
- SRAM 1KB
- Protected against overvoltage
- Supplied with separate header pins so you can determine your own configuration
- Auto-reset support

Pinouts:
- VCC: 3.3 volt input current
- GND: Ground pins.
- Serial: 0 (RX) and 1 (TX)
- External Interrupts: 2 and 3.
- PWM: 3, 5, 6, 9, 10, and 11. Provide 8-bit PWM output with the analogWrite() function.
- SPI: 10 (SS), 11 (MOSI), 12 (MISO), 13 (SCK). These pins support SPI communication.
- LED: 13. There is a built-in LED connected to digital pin 13. When the pin is HIGH value, the LED is on, when the pin is LOW, it's off
- I2C: A4 (SDA) and A5 (SCL). Support I2C (TWI) communication using the Wire library.
- Reset.

Dimensions
Length: 3.34cm
Width: 1.83cm
Height: 0.4cm